Kyselyt

#include <iostream>
using namespace std;
int q;
long long k;



int a(long long t){
  long long s=9;
  int nl=1;
  while (t>s*nl){
    t-=s*nl;
    s*=10;
    ++nl;
  }--t;
  long long k=(nl-1-(t%nl));
  long long l=t/nl;
  for (int i=0; i<k; ++i) l/=10;
  if (k==nl-1) ++l;
  return l%10;
}

int main(){
  cin >> q;
  for (int i=0; i<q; ++i){
    cin >> k;
    cout << a(k) << "\n";
  }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: ACCEPTED